pthread_setschedprio(3C) sets the scheduling priority for the specified thread.
int pthread_setschedprio(pthread_t tid, int prio);
#include <pthread.h> pthread_t tid; int prio; int ret;
pthread_setschedprio() returns zero after completing successfully. Any other return value indicates that an error occurred. When the following condition occurs, the function fails and returns the corresponding value.
EINVAL
Description: The value of prio is invalid for the scheduling policy of the specified thread.
ENOTSUP
Description: An attempt was made to set the priority to an unsupported value.
EPERM
Description: The caller does not have the appropriate permission to set the scheduling priority of the specified thread.
ESRCH
Description: The value specified by tid does not refer to an existing thread.